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TRMM Online Visualization and Analysis System (TOVAS)

warn_icon.gif IMPORTANT MESSAGE Mar 04, 2015    TMPA Restarted with October 2014   

On October 07, 2014, routine production ended for the TRMM PR precipitation estimates.  Since PR is no longer available, the TMI/PR combined instrument (TCI) estimates are also no longer available.  As products 3B42/3B43 use the TCI estimates as the satellite calibrator, September 2014 is the last month these products were produced in this way.  In an effort to continue 3B42/3B43 available and usable, the real time TMPA (TMPA-RT) climatological calibrations/adjustments have been adapted for use in the 3B42/3B43.  October 2014 is the first month of the climatologically calibrated/adjusted 3B42/3B43.  Users should note there will be a discontinuity in the record as a result.  Each individual user must determine the most appropriate use of the climatologically calibrated/adjusted 3B42/3B43 products.

The two-month latency for 3B42/3B43 remains the same with this new calibration.  The delayed release for October 2014 reflects both development work and a problem with the input IR data.  The previously released "provisional" data set is now considered obsolete and should not be used (although in many areas it is identical to this official release).  As well, a (different) problem with the input IR for November 2014 is not yet resolved, so that data set is still in provisional status.  We expect to have updated November 2014 IR data in the very near future, and thereafter run on the usual schedule.

For more details, see this document.


Welcome to TOVAS, a member of the Giovanni (GES-DISC Interactive Online Visualization ANd aNalysis Infrastructure) family, which provides users with an easy-to-use, Web-based interface for the visualization and analysis of global precipitation data.


Welcome to TOVAS, a member of the Giovanni (GES-DISC (Goddard Earth Sciences Data and Information Services Center) Interactive Online Visualization ANd aNalysis Infrastructure) family, which provides users with an easy-to-use, Web-based interface for the visualization and analysis of global precipitation data. See the FAQ for further usage on this tool.
Note: If you used the previous version of TOVAS, please read the following important changes:

1) The way to obtain a map for precipitation accumulated over a period has been changed in the new TOVAS. To obtain such map, select "accumulated_precipitation" from the parameter list and "Lat-Lon map, Time-accumulated" from "Select Visualization."

2) The "Lat-Lon map, Time accumulated" service is intended only for this parameter, "accumulated precipitation" or the like. Using it for other parameters may not make physical sense.

3) New output formats: HDF, NetCDF, ASCII, and Google Earth KMZ.


(*See Below for TMPA Subset ASCII Service)

Giovanni-4 Now Available: New! Please try out Giovanni-4, the next generation of Giovanni, with dramatically improved performance and interactive plotting and mapping.

Near-Real-Time Monitoring Product (For research, use Archive Data)

Satellite Rainfall Archives

Ground Observation Archives

Rainfall Product Intercomparison



TMPA Subset ASCII Service

If you are interested in subsetting and converting to ASCII the TMPA data, we have developed a new service that allows you to accomplish this through a URL call. Below is a sample of a URL and the required inputs:,-54,21,-14&TIME=2012-03-31T21:00:00%2F2012-03-31T21:00:00&FLAGS=3B42_V7,Area&SHORTNAME=3B42_V7&VARIABLES=Rain

Here are the acceptable inputs:



TIME=STARTTIME%2FENDTIME     (please retain the same format of YYYY-MM-DDTHH:MM:SS)

FLAGS=Product_version,Plot type   (plot type is ‘Area’ or ‘Time’, see next line for acceptable Product_version)

SHORTNAME=Product_version (acceptable values are the following: 3B42RT_V7, 3B42RT_Daily, 3B42_V6_Daily, 3B42_V6, 3B43_V6, 3B42_V7, 3B42_V7_Daily, 3B43_V7)

VARIABLES=variable (acceptable values is ‘Rain’ or ‘AccRain’)



Continued improvement of this online tool, and the production and dissemination of these data sets, depends on your (our users) informing us on how you have used this tool and these data. We are particularly interested in the value of this tool and these data sets to your research. Please send your comments to
Acker, J. G. and G. Leptoukh (2007).  Online analysis enhances use of NASA earth science data.  Eos, Trans., Amer. Geophysical Union, 88 (2),14, 17.
Berrick, S.W., G. Leptoukh, J.D. Farley,  and H. Rui. (2009).  Giovanni:  A Web service workflow-based data visualization and analysis system.  IEEE Trans. Geosci. Remote Sens., 47(1), 106-113.
Liu, Z., H. Rui, W. Teng, L.S. Chiu, G. Leptoukh, and G. Vicente. (2007). Online visualization and analysis: A new avenue to use satellite data for weather, climate and interdisciplinary research and applications. Measuring Precipitation from Space - EURAINSAT and the future, Advances in Global Change Research, 28, 549-558.
Liu, Z., D. Ostrenga, W. Teng,  and S. Kempler. (2012) Tropical Rainfall Measuring Mission (TRMM) Precipitation Data and Services for Research and Applications. Bulletin of the American Meteorological Society, doi:
Liu, Z., D. Ostrenga, W. Teng, S. Kempler, and L. Milich (2014), Developing GIOVANNI-based online prototypes to intercompare TRMM-related global gridded-precipitation products, Computers & Geosciences, in press, online version.
Please visit our other Giovanni Websites at the GES DISC: skip giovanni nav
Hurricane Data Analysis Tool (HDAT) :


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Last updated: Mar 10, 2015 01:36 PM ET